QA1 GD507-10450C Front Pro Coil Double Adj Coilover Kit Full Size GM 450 lbs/in

Vehicle Fitment

• 1971-1996 Chevrolet Impala, Caprice, Bel Air (GM Full-Size / B-Body / C-Body)
• 1977-1993 Chevrolet Caprice, Impala (GM B-Body)
• 1971-1996 Buick LeSabre, Electra, Estate Wagon (GM Full-Size)
• 1971-1996 Oldsmobile Delta 88, 98, Custom Cruiser (GM Full-Size)
• 1971-1996 Pontiac Bonneville, Catalina, Parisienne (GM Full-Size)
• 1978-1988 GM G-Body (Monte Carlo, Malibu, El Camino, Regal, Cutlass, Grand Prix) - with compatible spring perch geometry
• Compatible Ford full-size vehicles and Galaxies with equivalent front suspension geometry

Fitment Notes

• Bolt-in with both factory OE stamped steel control arms and QA1 tubular control arms - no control arm replacement required
• Upper mount: Stud type / Lower mount: Bar pin (T-bar type)
• Some applications may require the lower A-arm to be dropped for installation; shock body diameter may require enlarging the lower control arm shock opening on some applications
• Provides 0 to -2 inches of front ride height adjustability
• 450 lbs/in is the mid-range spring rate - suitable for average-weight full-size GM street builds; contact QA1 tech support for spring rate guidance based on front axle weight
• Register shocks at QA1 before installation to activate Limited Lifetime Warranty

Features

• Double adjustable GD507 Pro Coil shock - 18 independent compression positions x 18 independent rebound positions for 324 total valving combinations
• Provides 0 to -2 inches of front ride height adjustability via threaded shock body spring seat nut
• Includes a 10-inch tapered Style C high travel chrome silicon spring at 450 lbs/in - fewer coils and smaller wire diameter for increased travel and reduced unsprung weight
• Bolt-in with both factory OE and QA1 tubular control arms for maximum build flexibility
• Stud upper / bar pin T-bar lower mount configuration for stock-style full-size GM front suspension integration
• Suitable for street performance, autocross, road racing, drag racing, and street rod applications
• 100% dyno-tested and serialized for verified, consistent performance
• Serviceable and rebuildable by QA1 Authorized Service Centers
• Made in the USA at QA1's Lakeville, Minnesota facility

Specifications

• Part Number: GD507-10450C
• Type: Front Pro Coil Double Adjustable Coilover System
• Application: 1971-1996 GM Full-Size / B-Body / C-Body; 1978-1988 GM G-Body; Compatible Ford Full-Size
• Shock Model: GD507 Double Adjustable Pro Coil
• Compressed Length: 9.63 inches
• Extended Length: 14.50 inches
• Threaded Adjustment Range: 3 inches
• Compression Adjustment: 18 positions (independent)
• Rebound Adjustment: 18 positions (independent)
• Total Valving Combinations: 324
• Spring Length: 10 inches (tapered, Style C - large diameter flat upper)
• Spring Rate: 450 lbs/in
• Spring Material: Chrome Silicon High Travel
• Ride Height Adjustability: 0 to -2 inches
• Upper Mount: Stud Type
• Lower Mount: Bar Pin (T-Bar Type)
• Warranty: Limited Lifetime (register before installation)
• Quantity: Pair (2 shocks + 2 springs)
• Made in the USA

Included Components

• 2x QA1 GD507 Double Adjustable Pro Coil Front Shocks (100% Dyno-Tested and Serialized)
• 2x 10-Inch Tapered Style C High Travel Chrome Silicon Springs - 450 lbs/in
• 1x Complete Hardware Kit (all required mounting hardware)

Product Description

The QA1 GD507-10450C is a double adjustable front Pro Coil coilover system engineered as a bolt-in front suspension upgrade for 1971-1996 GM full-size vehicles - including the Impala, Caprice, Buick LeSabre, Oldsmobile 88, and Pontiac Bonneville - as well as compatible 1978-1988 GM G-Body applications and Ford full-size vehicles and Galaxies with equivalent front suspension geometry. This kit replaces the factory front coil spring and shock with a fully adjustable coilover assembly, delivering up to 2 inches of ride height drop and 324 valving combinations for comprehensive front suspension tuning from street driving to track use.

The GD507 double adjustable shocks provide independent compression and rebound control via two 18-position knobs. The included 10-inch tapered Style C chrome silicon high travel spring at 450 lbs/in is a mid-range option suited for average-weight full-size GM builds. This kit installs with both factory OE stamped steel control arms and QA1 tubular control arms with no mandatory control arm replacement. Each shock is 100% dyno-tested, serialized, and serviceable by QA1 Authorized Service Centers. Register at QA1 before installation to activate the Limited Lifetime Warranty.